﻿using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using HouseAgencySite.Models;

namespace HouseAgencySite.Areas.Admin.Controllers
{
    public class FileController : BaseController
    {
        //
        // GET: /Admin/File/

        [AcceptVerbs(HttpVerbs.Post)]
        [CheckLogin()]
        public JsonResult Upload(HttpPostedFileBase fileData,string ResourceID,string Description,int width=360,int height=210)
        {
            if (fileData != null)
            {
                try
                {
                    // 文件上传后的保存路径
                    string filePath = Server.MapPath("~/Images/");
                    if (!Directory.Exists(filePath))
                    {
                        Directory.CreateDirectory(filePath);
                    }
                    string fileName = Path.GetFileName(fileData.FileName);// 原始文件名称
                    string fileExtension = Path.GetExtension(fileName); // 文件扩展名
                    Files file = new Files();
                    file.Guid = Guid.NewGuid().ToString();
                    file.IsCover = false;                                  
                    string saveName = Guid.NewGuid().ToString() + fileExtension; // 保存文件名称
                    file.Url = saveName;
                    file.Create(file, CurrentUser);
                    file.ResourceID = ResourceID;
                    if (string.IsNullOrEmpty(Description)) Description = "无";
                    file.Description = Server.HtmlDecode(Description);
                    
                    fileData.SaveAs(filePath + saveName);
                    if (System.IO.File.Exists(filePath + saveName)) {
                        MakeThumbnail(filePath + saveName, filePath+"/_thumbs/"+saveName, width,height, "H", out saveName);
                    }
                    AgencyDBContext db = new AgencyDBContext();                    
                    db.Files.Add(file);                    
                    db.SaveChanges();
                    return Json(new { Success = true, FileName = fileName, SaveName = saveName });
                }
                catch (Exception ex)
                {
                    return Json(new { Success = false, Message = ex.Message }, JsonRequestBehavior.AllowGet);
                }
            }
            else
            {

                return Json(new { Success = false, Message = "请选择要上传的文件！" }, JsonRequestBehavior.AllowGet);
            }
        }
        public JsonResult GetFiles(string ResourceID)
        {
            AgencyDBContext db = new AgencyDBContext();
            var files=db.Files.Where(o => o.ResourceID == ResourceID).Select(o => o.Url).ToList();
            return Json(files, JsonRequestBehavior.AllowGet);
        }

        #region  生成缩略图  
  ///<summary>  
  /// 生成缩略图  
  /// </summary>  
  /// <param name="originalImagePath">源图路径（物理路径）</param>  
  /// <param name="thumbnailPath">缩略图路径（物理路径）</param>  
  /// <param name="width">缩略图宽度</param>  
  /// <param name="height">缩略图高度</param>  
  /// <param name="mode">生成缩略图的方式</param>  
        [NonAction]
        private void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode, out string outthumbnailPath)
        {
            Image originalImage = Image.FromFile(originalImagePath);

            int towidth = width;
            int toheight = height;

            int x = 0;
            int y = 0;
            int ow = originalImage.Width;
            int oh = originalImage.Height;
            switch (mode)
            {
                case "HW"://指定高宽缩放（可能变形）                  
                    break;
                case "W"://指定宽，高按比例                      
                    toheight = originalImage.Height * width / originalImage.Width;
                    break;
                case "H"://指定高，宽按比例  
                    towidth = originalImage.Width * height / originalImage.Height;
                    break;
                case "Cut"://指定高宽裁减（不变形）                  
                    if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
                    {
                        oh = originalImage.Height;
                        ow = originalImage.Height * towidth / toheight;
                        y = 0;
                        x = (originalImage.Width - ow) / 2;
                    }
                    else
                    {
                        ow = originalImage.Width;
                        oh = originalImage.Width * height / towidth;
                        x = 0;
                        y = (originalImage.Height - oh) / 2;
                    }
                    break;
                default:
                    break;
            }

            //新建一个bmp图片  
            System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);
            //新建一个画板  
            Graphics g = System.Drawing.Graphics.FromImage(bitmap);
            //设置高质量插值法  
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
            //设置高质量,低速度呈现平滑程度  
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            //清空画布并以透明背景色填充  
            g.Clear(Color.Transparent);
            //在指定位置并且按指定大小绘制原图片的指定部分  
            g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
             new Rectangle(x, y, ow, oh),
             GraphicsUnit.Pixel);
            try
            {

                bitmap.Save(thumbnailPath, originalImage.RawFormat);
                outthumbnailPath = thumbnailPath;
            }
            catch (System.Exception e)
            {
                throw e;
            }
            finally
            {
                originalImage.Dispose();
                bitmap.Dispose();
                g.Dispose();
            }
        }
        #endregion
    } 
    
}
